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Aromatic polyimide films were prepared and their dielectric constant and relaxation behavior were studied. Polyimide films have good insulating properties with dielectric constant values in the range of 2.88 - 3.48 at 1Hz and room temperature. Three relaxation processes (γ, β1 and β2) at sub-glass temperatures were observed and investigated. The cooperativity of the molecular motions associated with...
Heterocyclic polyimides based on bis (ketonaphthalic) dianhydrides and aromatic diamines containing oxadiazole rings were prepared and their dielectric properties were investigated. The dielectric constant values, measured at room temperature and in the frequency domain of 1 Hz-1MHz, were in the range of 2.7-3.1, being lower or comparable with those of commercial polyimide film Kapton which is one...
Thin films based on siloxane-containing polyimides have been prepared by the drop-casting technique. These films with thickness of tens of micrometers were flexible and resisted to repeated bendings. Very thin films having the thickness in the nanometer range, with neat surface, without pinholes or cracks, were obtained, as well. The mechanical and dielectric properties of these polyimide films were...
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